<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 2.为 ECharts 准备一个具备大小（宽高）的 DOM -->
      <div id="main" style="width: 750px;height:400px;"></div>
    </el-card>
  </div>
</template>

<script>
  //1.导入 echarts
  let echarts = require('echarts')

  import _ from 'lodash'
  export default {
    data() {
      return {
        //需要合并的数据
        options: {
          title: {
            text: '用户来源'
          },
          tooltip: {
            trigger: 'axis',
            axisPointer: {
              type: 'cross',
              label: {
                backgroundColor: '#E9EEF3'
              }
            }
          },
          grid: {
            left: '3%',
            right: '4%',
            bottom: '3%',
            containLabel: true
          },
          xAxis: [{
            boundaryGap: false
          }],
          yAxis: [{
            type: 'value'
          }]
        }
      }
    },
    created() {},
    //此时，页面上的元素，已经被渲染完毕了
    async mounted() {
      // 3.基于准备好的dom，初始化echarts实例
      var myChart = echarts.init(document.getElementById('main'));

      const {
        data: res
      } = await this.$http.get('reports/type/1')
      if (res.meta.status !== 200) {
        return this.$message.error('获取折线图数据失败！')
      }

      //4.准备数据和配置项
      //将两个数据合并
      const result=_.merge(res.data,this.options)

      //5.展示数据
      myChart.setOption(result);
    },
    methods: {}
  }

</script>

<style lang="less" scoped>

</style>
